chore(deps): update dependency verify.nunit to 30.12.0 (#4142)

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This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [Verify.NUnit](https://redirect.github.com/VerifyTests/Verify) |
`30.11.0` -> `30.12.0` |
[![age](https://developer.mend.io/api/mc/badges/age/nuget/Verify.NUnit/30.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/Verify.NUnit/30.11.0/30.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>VerifyTests/Verify (Verify.NUnit)</summary>

###
[`v30.12.0`](https://redirect.github.com/VerifyTests/Verify/compare/30.11.0...30.12.0)

[Compare
Source](https://redirect.github.com/VerifyTests/Verify/compare/30.11.0...30.12.0)

</details>

---

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src/Directory.Packages.props

@@ -44,7 +44,7 @@
     <PackageVersion Include="System.IO.FileSystem.Primitives" Version="4.3.0" />
     <PackageVersion Include="System.Runtime.Serialization.Primitives" Version="4.3.0" />
     <PackageVersion Include="System.Text.Json" Version="9.0.9" />
-    <PackageVersion Include="Verify.NUnit" Version="30.11.0" />
+    <PackageVersion Include="Verify.NUnit" Version="30.12.0" />
     <PackageVersion Include="Microsoft.Windows.CsWinRT" Version="2.3.0-prerelease.250720.1" />
     <PackageVersion Include="Microsoft.AspNetCore.Components" Version="$(AspNetVersion)" />
     <PackageVersion Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />